Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
This is a great driver that drives leds with a constant current of +/-680mA. Although it says it can power only one led in serie, it can also power two and the current is the same, also the heat dissipation.
I tried also three leds but with input voltage of 12.04 the curren't to the leds was only 540mA.. That may be higher if the input voltage was higher also (this is a guess, haven't tried).
Unfortunately it can not power three leds at 12V. Hey, but still, better than title says :-)
Efficiency with one cree P4 is 76%, with two is 82%. With three is 86% but the current is lower that it should be (540mA)
Still, it is better than description, so buy some of these!
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